package com.itheima.filter;


import com.alibaba.fastjson.JSONObject;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/*
* 检查用户是否已经完成了登录
* */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次请求的URI
        String requestURI = request.getRequestURI();

        //不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login" //移动端登录
        };

        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //如果不需要处理，则直接放行
        if(check){
            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }
        //1判断登录状态，如果登录状态，则直接放行
        if(request.getSession().getAttribute("employee") != null){

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            long id = Thread.currentThread().getId();//获取线程id
            log.info("线程id为：{}",id);

            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }

        //2判断登录状态，如果登录状态，则直接放行
        if(request.getSession().getAttribute("user") != null){

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            long id = Thread.currentThread().getId();//获取线程id
            log.info("线程id为：{}",id);

            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }

        //如果未登录，则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSONObject.toJSONString(R.error("NOTLOGIN")));
        return;
        
        


    }

    /*
    * 路径匹配，检查本次请求是否需要放行
    * */
    public boolean check(String[] urls,String requestURI){
        for (String url:urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
